Math
Ratio Calculator
Ratio Calculator is free to use. Enter your figures below and the result updates as you type. Use it for planning; it is an estimate, not advice.
About the Ratio Calculator
a : b = c : d, so d = b × c ÷ a.
Use it for recipes, maps and scaling. Keep the same unit on both sides of the ratio.
How to use the Ratio Calculator
- Enter each figure in the boxes above, using the same currency and time units.
- The result updates as you type. Press Calculate to refresh it at any time.
- Change one figure at a time to see how much it moves the result.
Frequently asked questions
What is the Ratio Calculator used for?
Use it for recipes, maps and scaling. Keep the same unit on both sides of the ratio.
How accurate is the Ratio Calculator?
It applies standard formulas to the figures you enter. Real results depend on actual rates, fees, taxes and timing, so treat the output as an estimate and confirm with your bank or adviser.
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